The Oglala (Lakota pronunciation: [oɡəˈlala] – lit. 'to scatter one's own') are one of the seven subtribes of the Lakota people who, along with the Dakota, make up the Očhéthi Šakówiŋ (Seven Council Fires). A majority of the Oglala live on the Pine Ridge Indian Reservation in South Dakota, the eighth-largest Native American reservation in the United States.

The Oglala are a federally recognized tribe whose official title is the Oglala Sioux Tribe of the Pine Ridge Reservation, South Dakota.

Oglala elders relate stories about the origin of the name "Oglala" and their emergence as a distinct group, probably sometime in the 18th century.

In the early 19th century, Europeans and American passed through Lakota territory in increasing numbers. They sought furs, especially beaver fur at first, and later bison fur. The fur trade changed the Oglala economy and way of life.

In 1868, the United States and the Great Sioux Nation signed the Fort Laramie Treaty. In its wake, the Oglala became increasingly polarized over how they should react to continued American encroachment on their territory. This treaty forfeited large amounts of Oglala land and rights to the United States in exchange for food and other necessities. Some Lakota bands turned to the Indian agencies — institutions that later served Indian reservations – for rations of beef and subsistence foods from the US government. Other bands held fast to Indigenous lifeways. Many Lakota bands moved between these two extremes, coming in to the agencies during the winter and joining their relatives in the north each spring. These challenges further split the various Oglala bands.

The influx of white settlers into the Idaho Territory often meant passing through Oglala territory, and, occasionally, brought with it its perils, as Fanny Kelly described in her 1871 book, Narrative of My Captivity among the Sioux Indians.

The Great Sioux Reservation was broken up into five portions. This caused the Red Cloud Agency to be moved multiple times throughout the 1870s until it was relocated and renamed the Pine Ridge Reservation in 1878. By 1890, the reservation included 5,537 people, divided into a number of districts that included some 30 distinct communities.

In July 2022, the Oglala Sioux Tribal Council effected a temporary suspension of Christian missions on the Pine Ridge Reservation. The council called for an investigation into the financial practices of the Dream Center Missionary, and the Jesus is King Mission was ejected from the reservation for spreading pamphlets that the tribe saw as hateful.